Pity they chose this system to avoid stacking buffs. They should at least allow castersy to concentrate on more than one spell. Maybe 1/2 of the casting ability. And to avoid stacking buff just make the highest take effect. Problem solved
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But playing my second time with a caster i looked especially for concentration breaks. For some reaso NPCs have it easier to maintain it.
All in all most enemy NPCs are not true to the rules anyway. Just look at the stats of the lvl 2 npcs in the first crypt. Most have 18 on the main ability...which should not be possible with the rules we PCs have to use.
